Self-contained electro-hydraulic actuating device

Claim 1

AN ELECTRO-HYDRAULIC DEVICE COMPRISING A SELF-CONTAINED PORTABLE ASSEMBLY FORMING A SINGLE UNIT ADAPTED TO BE ASSOCIATED WITH A DEVICE TO BE CONTROLLED, SAID ASSEMBLY COMPRISING A DOUBLE ACTING JACK INCLUDING A PISTON ROD ADAPTED FOR BEING CONNECTED TO THE DEVICE TO BE CONTROLLED, SAID JACK INCLUDING A PISTON DEFINING TWO ISOLATED AND OPPOSED CHAMBERS IN THE JACK, MEANS INCLUDING AN ELASTIC CONNECTION BETWEEN THE ROD AND THE PISTON, SAID ELASTIC CONNECTION COMPRISING A STACK OF ELASTIC WASHERS, THE ASSEMBLY FURTHER COMPRISING A REVERSIBLE MOTOR, A PUMP DRIVEN BY SAID MOTOR, A HAND PUMP AND A HYDRAULIC CIRCUIT CONNECTING THE MOTORDRIVEN PUMP, THE JACK AND THE HAND PUMP, SAID HYDRAULIC CIRCUIT INCLUDING TWO COMPENSATION VALVES TO CORRECT THE EFFECTS OF THE DIFFERENCES OF SECTIONS OF THE CHAMBERS OF THE JACK AND OF POSSIBLE LEAKAGES FROM THE PUMPS, AND TOW NON-RETRUN VALVES PERMITTING MANUAL CHANGE OVER OF DELIVERY TO SAID JACK FROM SAID PUMP DRIVEN BY THE MOTOR AND SAID HAND PUMP, SAID HYDRAULIC CIRCUIT FURTHER INCLUDING A PAIR OF CONDUITS EXTENDING FROM THE MOTORDRIVEN PUMP TO THE SEPARATE CHAMBERS OF THE JACK TO ALTERNATE THE SUPPLY OF PRESSURE FLUID TO THE CHAMBERS OF THE JACK IN ACCORDANCE WITH THE DIRECTION OF ROTATION OF THE MOTOR, AND LIMITING SWITCH MEANS IN EACH CHAMBER OF JACK FOR TERMINATING OPERATION OF SAID MOTOR WHEN THE PISTON REACHES END POSITIONS IN THE JACK.